JP4136177B2 - In-pipe insertion jig for pipe working equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-pipe working device in which a working portion is provided at the tip of a flexible rigid long body through a through-hole communicating with the pipe from the pipe radial direction to the inside of the pipe from the direction inclined with respect to the pipe axis. A guide cylinder that guides the insertion direction of the in-pipe working device from the through-hole into the pipe, and a fixing cylinder that fixes the guide cylinder to the pipe side. The present invention relates to a pipe insertion jig of a pipe working apparatus in which shafts are connected in an obliquely intersecting posture.
[0002]
[Prior art]
As an example of the in-pipe working device, an in-pipe insertion jig used for inserting the in-pipe water extraction device for extracting the water accumulated in the gas pipe for city gas supply into the pipe in a live pipe state without stopping the gas supply. As shown in FIG. 8, a shutter device E that opens and closes the through hole 1 formed in the clamp member 2 by airtightly fixing the cylindrical clamp member 2 divided in half in the radial direction to the outer peripheral surface of the gas pipe B. After the gas pipe B is cut through the through-hole 1 in the airtight position, the pipe insertion jig A0 is airtightly fixed to the shutter apparatus E, and the pipe bleeder C is opened and closed. It is configured to be inserted into the gas pipe B from the direction inclined with respect to the pipe axis X through the through hole 30 for use and the through hole 1 of the clamp member 2.
That is, as shown in FIG. 4, the shutter device E is fixed to the cylindrical portion 5 forming the through hole 1 of the clamp member 2, and the gas pipe B is formed by the hole saw F that is airtightly attached to the upper surface of the shutter device E. After the middle portion is cut off, the through-hole 1 is closed with the shutter device E, and the in-tube insertion jig A0 is airtightly attached instead of the hole saw F as shown in FIG. And the in-pipe extraction device C is inserted into the gas pipe B through the opening / closing through hole 30 and the through hole 1.
The in-pipe insertion jig A0 includes a guide cylinder 3 for guiding the insertion direction of the in-pipe extraction device C and a fixing cylinder 4 for fixing the guide cylinder 3 to the shutter device E. Y and Z are connected in a posture that crosses diagonally.
Conventionally, as shown in FIG. 8, a cylindrical member 20 provided on the inner peripheral surface thereof with an internal thread portion 31 for screwing the fixing cylinder 4 along the peripheral edge of the opening / closing through hole 30 of the shutter device E. Is sealed between the inner peripheral portion of the cylindrical member 20 screwed along the peripheral edge of the opening / closing through hole 30 and the outer surface portion of the shutter device E surrounding the peripheral edge of the opening / closing through hole 30. A holding frame 33 for the elastic sealing material 32 is provided in a bowl shape.
[0003]
[Problems to be solved by the invention]
For this reason, the in-pipe extraction device C can easily come into contact with the portion 34 on the upper side in the insertion direction in the gas pipe B of the in-pipe extraction device C in the holding frame 33 provided in the fixing cylinder 4. There is a defect that the tip of the device C comes into contact with the holding frame 33 so that it cannot be inserted properly, or that the in-pipe extraction device C is easily rubbed against the holding frame 33 and is easily damaged as the in-pipe extraction device C is inserted.
In order to solve this drawback, for example, a notch that allows the in-pipe extraction device C to enter is formed in the upper portion 34 in the insertion direction in the gas pipe B of the in-pipe extraction device C in the holding frame 33. However, in this case, the elastic seal member 32 cannot be held well by the holding frame 33, so that the peripheral edge of the tubular member 20 and the opening / closing through hole 30 is surrounded. There is a problem that the sealing property between the outer surface portion and the outer surface portion cannot be ensured.
The present invention has been made in view of the above circumstances, and it is easy to insert an in-pipe working device while ensuring a sealing property between a cylindrical member and an outer surface surrounding a peripheral edge of a through-hole. An object of the present invention is to provide a tube insertion jig in which the device is not easily damaged.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, a pipe working device having a working portion provided at the tip of a flexible rigid long body is connected to the pipe shaft through a through-hole communicating with the pipe from the pipe radial direction. A guide cylinder for guiding the insertion direction of the in-pipe working device from the through-hole into the pipe, and a fixing cylinder for fixing the guide cylinder to the pipe side in order to insert into the pipe from a direction inclined with respect to the pipe A pipe insertion tool of a pipe working device in which the cylinder shafts are connected in an obliquely intersecting manner, and the fixing cylinder is screwed along the periphery of the through hole. Sealing between the outer peripheral part of the cylindrical member screwed along the peripheral edge of the through hole and the outer surface part surrounding the peripheral edge of the through hole on the outer peripheral side of the cylindrical member provided with an external thread part on the outer peripheral surface A holding frame for elastic sealing material is provided in a bowl shape, and the in-pipe working device of the guide cylinder is formed. A portion on the upper side in the insertion direction in the tube is connected to the holding frame, and is a portion on the upper side in the insertion direction in the tube of the in-pipe working device of the fixing cylinder, and the cylindrical shape A notch that allows entry of the in-pipe working device is formed in a portion extending between the member and the holding frame.
[Operation] Cylindrical member screwed along the peripheral edge of the through hole on the outer peripheral side of the cylindrical member provided with a male thread portion on the outer peripheral surface for screwing the fixing cylinder along the peripheral edge of the through hole The holding frame of the elastic sealing material that seals between the outer peripheral portion of the through hole and the outer surface portion surrounding the periphery of the through-hole is provided in a bowl shape, and the guide cylinder is inserted in the pipe of the pipe working device in the pipe direction. Since the upper-side portion is connected to the holding frame, it is the upper-side portion of the fixing cylinder in the insertion direction in the pipe of the in-pipe working device, and spans the cylindrical member and the holding frame. Even if a notch that allows entry of the in-pipe working device is formed in the part, the elastic sealing material corresponding to the notch can be held by the outer periphery of the holding frame.
[Effect] Therefore, the elastic sealing material is held by the holding frame, and a notch that allows the in-pipe working device to enter is formed while ensuring the sealing performance between the cylindrical member and the outer surface surrounding the periphery of the through hole. Therefore, the in-pipe working device can be easily inserted, and the in-pipe working device is not easily damaged.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
FIG. 1 shows an example of an in-pipe working device, an in-pipe extraction device C for draining water accumulated in a steel low-pressure gas pipe B for city gas supply buried in the soil to the outside of the pipe. An in-pipe insertion jig A used for insertion into the tube is shown.
The in-pipe extraction device C includes a suction part C2 for sucking water in the gas pipe B and a CCD camera for in-pipe shooting at the end of a draw hose C1 made of hard polyethylene resin as a rigid long body having flexibility. A working part D for extraction work provided with C3 is provided, and the extraction hose C1 wound around a drum (not shown) is fed out through a through hole 1 communicating with the gas pipe B from the pipe radial direction. The gas tube B is inserted from the direction inclined with respect to the tube axis X.
[0007]
The in-pipe insertion jig A is connected to the in-pipe extraction device C through the through-hole 1 formed in the cylindrical clamp member 2 made of bisected cast iron in the radial direction that is airtightly fixed to the outer peripheral surface of the gas pipe B. A guide cylinder 3 for guiding the insertion direction from the through hole 1 of the in-pipe water extraction apparatus C into the gas pipe B, and a clamp on the gas pipe B side. A fixing cylinder 4 fixed to the member 2 is connected in such a manner that the cylinder axes Y and Z cross each other obliquely.
As will be described later, the clamp member 2 is provided in order to excise a middle portion of the gas pipe B through the through-hole 1 in a live pipe state in which the supply of gas (fluid) is not stopped, and is fixed on the upper side. The clamp member 2 a is provided with a cylindrical portion 5 for forming the through hole 1, and a female screw portion 6 is formed on the inner peripheral surface of the cylindrical portion 5.
[0008]
The guide cylinder 3 is composed of a small-diameter cylinder 7 that passes through the in-pipe extraction device C concentrically, and a large-diameter cylinder 8 that is welded and fixed to the periphery of the fixing cylinder 4. A connecting cylinder 11 provided with an internal thread portion 10 on the inner peripheral surface is welded and fixed to a closing plate 9 that closes the upper end portion of the large-diameter cylindrical body 8, and a small diameter is attached to the internal thread portion 10 of the connecting cylinder 11. The male threaded portion 12 formed on the outer peripheral surface of the cylindrical body 7 is screwed so that the small-diameter cylindrical body 7 and the large-diameter cylindrical body 8 are sealed with their cylindrical axes Y1 and Y2 being parallel to each other. The O-ring 13 is sandwiched and hermetically fixed.
The large-diameter cylindrical body 8 includes an observation window 14 for observing the state of insertion into the gas pipe B from the through-hole 1 of the in-pipe extraction device C, and in-pipe extraction while observing the state of the in-pipe extraction device C from the observation window 14. A pressing tool 15 that presses the device C and finely adjusts the insertion direction from the through hole 1 into the gas pipe B is provided.
An elastic rubber 17 for sealing, in which an insertion hole 16 of the in-pipe water extraction apparatus C is formed, is attached to the inside of the upper part of the small-diameter cylindrical body 7, and the flange member 18 is screwed to the outer periphery of the upper part of the small-diameter cylindrical body 7. It has been retained by.
[0009]
The fixing cylinder 4 is screwed along the peripheral edge of the through-hole 1 on the outer peripheral side of the cylindrical member 20 provided with a male screw portion 19 screwed along the peripheral edge of the through-hole 1. A holding frame 22 of a ring-shaped elastic sealing material 21 that seals between the outer peripheral portion of the cylindrical member 20 and the outer surface portion surrounding the periphery of the through hole 1 is provided in a bowl shape.
That is, the male threaded portion 19 formed on the outer peripheral surface of the cylindrical member 20 is screwed to the female threaded portion 6 formed on the inner peripheral surface of the cylindrical portion 5, and the fixing cylinder 4 is fixed to the clamp member 2. An elastic sealing material 21 that seals between the outer peripheral portion of the cylindrical member 20 fixed to the clamp member 2 and the outer surface portion of the cylindrical portion 5 is provided on a holding frame 22 provided in a bowl shape on the outer peripheral side of the cylindrical member 20. Is retained.
The outer peripheral surface 5a of the cylindrical part 5 is formed to have a tapered surface with a larger diameter toward the base side, and an elastic seal is formed as the male screw part 19 of the cylindrical member 20 is screwed into the female screw part 6 in the tightening direction. Regardless of the screwing operation over the half rotation in the tightening release direction of the fixing cylinder 4 which is deformed so that the thickness in the radial direction of the material 21 becomes thin and is screwed to the cylinder part 5 in an airtight manner, The sealing function of the elastic sealing material 21 can be maintained.
[0010]
And the end part of the large diameter cylinder 8 which comprises the cylinder 3 for a guide is weld-fixed to the upper surface of the holding frame 22 over the perimeter, and the pipe | tube extraction apparatus C of the cylinder 3 for a guide is carried out. The portion 23 on the upper side in the insertion direction in the gas pipe B is connected to the holding frame 22, and as shown in FIG. 2, the insertion direction in the gas pipe B of the in-pipe extraction device C in the fixing cylinder 4. And a notch 24 that allows the in-pipe water extraction apparatus C to enter the region that is on the upper side and that extends near the connection portion of the holding frame 22 to the guide cylinder 3 and the lower end of the tubular member 20. Is formed.
[0011]
A procedure for draining the water accumulated in the gas pipe B by inserting the pipe extraction device C into the gas pipe B in the live pipe state using the above-mentioned pipe insertion jig A will be described.
As shown in FIG. 3, the clamp member 2 is fixed to the gas pipe B and the outer peripheral surface thereof is hermetically enclosed, and as shown in FIG. 4, the shutter device E is airtightly fixed to the cylinder portion 5 of the clamp member 2. Then, a hole saw F is screwed onto the upper surface of the shutter device E, and a halfway portion of the gas pipe B is cut with the hole saw F, and then the through hole 1 of the cylindrical portion 5 is closed with the shutter device E, and the hole saw F is moved to the shutter device. Remove from E.
Next, as shown in FIG. 5, a transparent sheet gas bag 25 that covers the clamp member 2 together with the shutter device E is attached to the gas pipe B, and the in-pipe insertion jig A is put in the gas bag 25 in advance. .
Next, by operating from the work hole provided in the gas bag 25, the shutter device E is removed from the clamp member 2, passed through the through hole 1 of the clamp member 2, and the extracted pipe in the pipe at the lower part of the gas tube excision inside the clamp member 2. A guide plate 27 provided with left and right guide surfaces 26 for guiding the insertion direction of the apparatus C in a direction along the longitudinal direction of the gas pipe B is installed.
As shown in FIG. 6, the guide plate 27 is fixed to the inner bottom surface of the clamp member 2 by a magnet 28 attached to the bottom surface thereof.
Next, as shown in FIG. 6, the fixing cylinder 4 is placed on the cylinder portion 5 of the clamp member 2 so that the guiding cylinder 3 is positioned on the lower side in the insertion direction in the gas pipe B of the in-pipe extraction apparatus C. The pipe insertion jig A is fixed to the clamp member 2, and the pipe water extraction device C is pushed through the insertion hole 16 of the elastic rubber 17 attached to the guide cylinder 3, so that the water extraction hose C1 is drummed. Is inserted into the gas pipe B.
When the in-pipe water extraction device C is inserted into one of the gas pipes B located on the left and right of the in-pipe insertion jig A and the drawing operation is completed, the drawing hose C1 is wound around the drum, The in-pipe water extraction apparatus C is pulled out from the gas pipe B, the working part D is accommodated inside the in-pipe insertion jig A, and the in-pipe insertion jig A is rotated together with the working part D by a half turn, and the other gas pipe The in-pipe extraction device C is inserted into B and the extraction operation is performed.
When the water extraction operation is completed, the in-pipe insertion jig C is extracted from the in-pipe insertion jig A, the in-pipe insertion jig A is removed from the clamp member 2, and the plug 29 is hermetically sealed in the through hole 1 of the clamp member 2. Tighten and fix.
[0012]
[Other Embodiments]
1. The in-pipe insertion jig of the in-pipe work apparatus according to the present invention may be used for inserting the in-pipe work apparatus equipped with the in-pipe inspection camera in the work portion into the pipe. There is no particular limitation.
2. The in-pipe working device jig according to the present invention may be configured to be fixed directly to the periphery of a through-hole formed in the tube wall of the pipe into which the in-pipe working device is to be inserted.
3. The in-pipe insertion jig of the in-pipe working apparatus according to the present invention may be configured to be fixed to the periphery of the opening / closing through hole of the shutter device attached to the cylinder part forming the through hole of the clamp member. .
4). The in-pipe insertion jig of the in-pipe work device according to the present invention has a notch that allows the in-pipe work device to enter, near the connection portion of the holding frame with the guide cylinder, and an intermediate position in the cylinder axis direction of the cylindrical member. It may be formed in a part extending over.
5. In the pipe insertion jig of the pipe working device according to the present invention, the hole saw is directly clamped and fixed to the cylinder part of the clamp member in the gas bag, and the middle part of the gas pipe is cut with the hole saw, and then replaced with the hole saw. In addition, the in-tube insertion jig may be screwed to the cylinder portion of the clamp member in the gas bag.
6). The in-pipe insertion jig of the in-pipe work apparatus according to the present invention may be used for inserting the in-pipe work apparatus into a liquid supply pipe other than a gas such as a water pipe.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a jig for insertion in a pipe. FIG. 2 is a plan view of a main part. FIG. 3 is a plan view showing a work procedure. [Fig. 6] Partial cross-sectional side view showing the work procedure [Fig. 7] Main cross-sectional view showing the work procedure [Fig. 8] Partial cross-sectional side view showing the prior art [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Through-hole 3 Guide cylinder 4 Fixing cylinder 19 Male thread part 20 Cylindrical member 21 Elastic seal material 22 Holding frame 23 Part 24 Notch B Pipe C In-pipe working device C1 Long body D Working part X Pipe axis Y, Z cylinder shaft

Claims (1)

In order to insert an in-pipe working device having a working portion at the tip of a flexible rigid long body into a pipe from a direction inclined with respect to the pipe axis through a through hole communicating with the pipe from the pipe radial direction. The guide cylinder that guides the insertion direction of the in-pipe working device from the through hole into the pipe and the fixing cylinder that fixes the guide cylinder to the pipe side are inclined with respect to each other. An in-pipe insertion jig of the in-pipe working device connected in a crossover posture,
A cylindrical member screwed along the peripheral edge of the through-hole on the outer peripheral side of the cylindrical member provided on the outer peripheral surface with a male thread portion for screwing the fixing cylinder along the peripheral edge of the through-hole. An elastic sealing material holding frame that seals between the outer periphery and the outer surface surrounding the periphery of the through hole is provided in a bowl shape,
Of the guide cylinder, connect a portion on the upper side in the insertion direction in the pipe of the in-pipe working device to the holding frame,
Of the fixing cylinder, the in-pipe working device is inserted into a portion on the upper side in the insertion direction in the pipe of the in-pipe working device and extending over the cylindrical member and the holding frame. An in-pipe insertion jig for an in-pipe working device in which a notch is formed.

Images